Is the term "Mexican" becoming extinct? Probably... but then again the way things are going the country of Mexico will likely become extinct also... Why? Because everyone but the drug dealers are fleeing there in search of a better way of life. But don't feel too bad, you don't see the Mayan nation or hear the Mayan language any more either. Just write it off as another example of natural selection. Be that as it may, take heart... if you make it to America, we will teach you a superior language... its called "English." Once you learn to master it, you wont miss archaic terms like "Mexican."